3628417 - "There can be only one main assignment" warning upon adding a concurrent employment - SAP SuccessFactors Employee Central

A warning message appears when adding concurrent employment: "There can be only one main assignment, which means x out of y assignments should be selected as secondary assignments."

SAP SuccessFactors Employee Central

warning message, concurrent employment, sap successfactors, employee central, main assignment, secondary assignment, not applicable, terminated employment, validation, rehire, inactive employment, setup configuration, There can be only one main assignment which means  out of  assignments should be selected as secondary assignments. There is another associated record in this transaction that is marked with a warning. Resolve that warning to avoid data inconsistencies. , KBA , LOD-SF-EC-CON , Concurrent Employment , Problem